US3793501A - Explosive switch - Google Patents

Explosive switch Download PDF

Info

Publication number
US3793501A
US3793501A US3793501DA US3793501A US 3793501 A US3793501 A US 3793501A US 3793501D A US3793501D A US 3793501DA US 3793501 A US3793501 A US 3793501A
Authority
US
Grant status
Grant
Patent type
Prior art keywords
plunger
pair
circuit
explosive
pins
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
Inventor
D Stonestrom
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zeneca Inc
Original Assignee
Zeneca Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Grant date

Links

Images

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H39/00Switching devices actuated by an explosion produced within the device and initiated by an electric current

Abstract

An explosive switch capable of opening or closing one or more poles. An explosive charge moves a piston to which are fixed one or more plungers, each plunger acting as part of a separate pole. Each plunger has a wide portion and a narrow portion. Metal contacts are provided which fit over the wide portion, making the pole normally opened, or over the narrow portion, making the pole normally closed. The piston can also disconnect a connection to the bridgewire.

Description

United States Patent 1 Stonestrom EXPLOSIVE SWITCH [75] Inventor: Donald M. Stonestrom, West Chester, Pa,

[73] Assignee: ICI America Inc., Wilmington, Del.

[22] Filed: Dec. 4, 1972 [21] Appl. N0.: 311,494

Related US. Application Data [63] Continuation-in-partbf Ser. No. 145,608, May 12, 1971, abandoned.

[52] US. Cl. .J. ZOO/61.08 [51] Int. Cl. H0lh 39/00 [58] Field of Search ZOO/61.08, 168 F [56] References Cited UNITED STATES PATENTS 2,931,874 4/1960 Leaman ZOO/61.08 X

[4 1 Feb. 19,1974

8/1966 Gay ZOO/61.08 X

3,264,438 3,277,255 10/1966 Mattsson et al. ZOO/61.08 3,286,064 11/1966 Wilson et a1 ZOO/61.08 X

FOREIGN PATENTS OR APPLICATIONS 916,030 1/1963 Great Britain 200/6108 Primary Examiner-.1. R. Scott [57] ABSTRACT An explosive switch capable of opening or closing one or more poles. An explosive charge moves a piston to which are fixed one or more plungers, each plunger acting as part of a separate pole. Each plunger has a wide portion and a narrow portion. Metal contacts are provided which fit over-the wide portion, making the pole normally opened, or over the narrow portion, making the pole normally closed. The piston can also disconnect a connection to the bridgewire.

8 Claims, 8 Drawing Figures l EXPLOSIVE SWITCH I have invented an explosive switch where the explosive charge moves a piston within a casing. To the piston are fixed one or more plungers, each acting as a separate pole. Each plunger has a wide portion and a narrow portion. If a contact which fits over the wide portion is used, the pole is normally opened. If a contact which fits over the narrow portion is used, the pole is normally closed. The contacts may be easily arranged to give various combinations of normallyopened or normally-closed poles. Initation of the explosive charge forces the plunger between two pins and forces the narrow portion into an insulated well.

The piston in the switch may also disconnect a connection to the bridgewire in a bridgewire-ignited explosive charge. This is an important advantage where the power supply is of a limited capacity since occasionally the bridgewire will fail to completely rupture and will continue to drain the source of electrical energy.

FIG. 1 is a longitudinal, mid-sectional view of the closed firing circuit of a one-shot electro-explosive switch capable of opening or. closing two independent circuits and is the presently preferred embodiment of this invention.

' FIG. 2 is a cross-sectional view through random section 22 in FIG. 1 showing both sides of the switch and all circuit pins.

FIG. 3 is a cross-sectional view through 3-3 in FIG.

1 showing both sides of the switch and the firing circuit.

FIG. 4 is a longitudinal, mid-sectional view of the switch shown in FIG. 1 which has been activated and where the firing circuit is open.

FIG. 5 is a cross-sectional view of FIG. 1 taken through 55 in FIGS. 2 and 3 showing the switch before activation and one circuit open.

FIG. 6 is the view of FIGS after firing and the closed circuit.

FIG. 7 is a longitudinal view of FIG. 1 taken through 7 --7 in FIGS. 2 and 3 showing the closed circuit before firing.

FIG. 8 is the view of FIG. 7 after firing showing the circuit open.

In FIGS. 1 through 8, of casing 1 has a base 2 which 1 holds six pins 3, 4, 5, 6, 7, and 8 (see FIGS. 2, 5, and 6 for pins 7 and 8) imbedded in glass 9 forming a glassto-metal seal between pins 3, 4, 5, 6, 7, and 8 and base 2. The pins are supported by plastic mounting l0. Wire contacts 11 and 12 have end portions 13 and 14, re-

spectively, which touch pins 5 and 6, respectively, and also touch pins 15 and 16, respectively, which are held by piston 17. Piston 17 comprises plastic part 18 and metal part 19 which holds pins 15 and 16 in glass seal 20. An O-ring 21 is mounted on the metal part 19 of the piston to prevent gas leaking. A bridgewire 22 joins pins 16 and 15 and is coated with explosive charge 23. A cup 24 prevents the piston from moving upward.

FIG. 3 shows that plastic part 18 has two plungers 25 and 26 which have wide portions 27 and 28, respectively, and narrow end portions 29 and 30, respectively. FIG. 2 shows key 31 of plastic part 18 which keeps plastic part 18 centered in aperture 32 of plastic mounting l0 and prevents it from rotating (see FIG. 1 also). Plastic mounting 10 has a thin breakaway portion 33 which prevents the switch from functioning when shocked, vibrated, or otherwise subjected to G-forces in the downward direction. It also contains the aperture 32 for key 31.

In FIGS. 7 and 8, short metal contact 34 having end portions 35 and 36 completes the circuit between pins 3 and 4 making a normally-closed switch. Contact 34v is held in place by narrow portion 29 of'plunge'r 25 which presses against contact 34 directly above a well 38 in plastic mounting 10 formed from a portion 39 of 'plastic mounting 10.

In FIGS. 5 and 6, plunger 26 has long metal contact 40 fitted over it and this contact completes the circuit between pins 7 and 8 after firing. Both metal contacts are held in place before firing by thin breakaway portion 33.

The switch is assembled with either two short contacts giving two normally-closed poles, two long contacts giving two normally-opened poles, or one of each as shown in the drawings. In FIG. 1, a current is sent through the circuit pin 5 (shortened to designate firing circuit) to wire contact 1 1 to pin 15 to bridgewire 22 to pin 16 to wire contact 12 to pin 6. This initiates explosive charge 23 forcing piston 17 down so that plastic part 18 disconnects metal contacts 11 and 12 from pins 15 and 16, respectively, by pushing end portions 13 and 15 away from pins 15 and 16, respectively. The switch is sealed before and after initiation and no gases from the explosion escape as can be seen in FIG. 4.

For a plunger having a short metal contact fitted over it (FIG. 7) forming a normally-closed switch, the plunger severs breakaway portion 33 pushing it and metal contact 34 into well 38. As can be seen from FIG. 8, portion 39 of plastic mounting 10 will cause end portions 35 and 36 of contact 34 to separate from pins 3 and 4. I

For a plunger having a long metal'contact fitted over it forming a normally-opened switch, it can be seen from FIG. 5 that contact 40 will not touch pins 7 or 8 prior to initiation, but in FIG. 6 will touch both pins after firing thereby closing the pole.

The switch could also be made with only one pole or with many poles. The explosive charge configuration may be 1 watt, 1 amp, or have RF protection by using techniques well known in the art. A delay between the application of current to the switch and its functioning may be provided by interposing a pyrotechnic delay column between an igniter above the piston and the explosive charge. Molded phenolic parts or other suitable materials may be substituted for the glass-to-metal seals. A four-lobed ring seal, bellows seal, or other suitable seal may be substituted for O-ring 21. The parts referred to as plastic" may be made from suitable materials which are technically not plastics. Other variations will no doubt also come to mind.

Switches having both normally-opened and normallyclosed poles similar to the one shown in the drawings have been made, subjected to severe tests, and successfully functioned. They are remarkably small, about 6 inches long (not including pins) and about 5/16 inches in diameter, and have withstood 13,600 Gs in the downward direction.

What is claimed is:

1. An explosively activated electrical switch comprismg:

a. a casing having an insulative base and within said casing a piston in movable engagement therewith, said piston having a pair of electrical contact pins and at least one insulative plunger connected thereto, said plunger having a wide portion and a leading narrow end portion, conductive means disposed on said insulative plunger, said electrical contact pins being in electrical contact through conductive means with at least one pair of firing circuit pins passing through said base;

b. an explosive charge within said casing positioned so that said piston moves when electrical current is passed through said pair of firing circuit pins; and

c. at least one other pair of circuit pins passing through said base positioned in cooperative relationship with said plunger, said plunger conductive means being such that it forms a closed circuit between said other pair of circuit pins either before or after said explosive is initiated to move said piston.

2. An explosively activated electrical switch of claim 1 wherein said plunger conductive means is a metal contact capable of fitting over-the wide portion of said plunger, and said other pair of metal circuit pins passing through said base are separated by a distance no greater than the width of said conductive means fitted over said wide portion.

3. An explosively activated switch according to claim 1 wherein said conductive means is positioned in contact with said pair of circuit pins passing through said base and which is capable of extending over the wide portion of said plunger after said explosive charge is initiated to move said piston) 4. An explosively activated electrical switch according to claim 3 wherein said pair of circuit pins passing through said base have an insulating well therebetweeri such that when said explosive charge is initiated said plunger conductive means is forced into said insulating well out of electrical contact with said circuit pins.

5. An explosive switch according to claim 4 wherein said well is covered with a breakaway barrier.

6. An explosive switch according to claim 1 wherein at least two plungers are in cooperative relationship with at least two pairs of circuit pins passing through said base.

7. An explosive switch according to claim 6 wherein the plunger conductive means of at least one plunger forms a closed circuit with at least one pair of circuit pins before said charge is initiated and at least a second plunger forms a closed circuit with a second pair of circuit pins after said charge is initiated.

8. An explosive switch according to claim 1 wherein said explosive charge is electrically initiated through a bridgewire connected across said pair of electrical contact pins in said piston.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION PATENT NO. 3,793,501

f Febr a y 19' INVENTOR(S) n ld M. Stonestrom It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 1, line 47, "of casing 1'' should read a casing l Column 2, line 27, "13 and 15" should read l3 and 14 Signed and Scaled this twenty-first D a Of October 19 75 [SEAL] A ttes t:

RUTH C. MASON C. MARSHALL DANN Arresting Officer Commissioner ofPatenrs and Trademarks UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION PATENT NO. 3,793,501

DATED February 19, 1974 INVENTOMS) 3 Donald M. Stonestrom It is certified that error appears in the ab0ve-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 1, line 47, "of casing 1" should read a casing l Column 2, line 27, "13 and 15" should read l3 and 14 w Signed and Sealed this twenty-first Day of October 1975 [SEAL] i Attest:

RUTH C MASON C. MARSHALL DANN Arresting Officer Commissioner ofParenrs and Trademarkx

Claims (8)

1. An explosively activated electrical switch comprising: a. a casing having an insulative base and within said casing a piston in movable engagement therewith, said piston having a pair of electrical contact pins and at least one insulative plunger connected thereto, said plunger having a wide portion and a leading narrow end portion, conductive means disposed on said insulative plunger, said electrical contact pins being in electrical contact through conductive means with at least one pair of firing circUit pins passing through said base; b. an explosive charge within said casing positioned so that said piston moves when electrical current is passed through said pair of firing circuit pins; and c. at least one other pair of circuit pins passing through said base positioned in cooperative relationship with said plunger, said plunger conductive means being such that it forms a closed circuit between said other pair of circuit pins either before or after said explosive is initiated to move said piston.
2. An explosively activated electrical switch of claim 1 wherein said plunger conductive means is a metal contact capable of fitting over the wide portion of said plunger, and said other pair of metal circuit pins passing through said base are separated by a distance no greater than the width of said conductive means fitted over said wide portion.
3. An explosively activated switch according to claim 1 wherein said conductive means is positioned in contact with said pair of circuit pins passing through said base and which is capable of extending over the wide portion of said plunger after said explosive charge is initiated to move said piston.
4. An explosively activated electrical switch according to claim 3 wherein said pair of circuit pins passing through said base have an insulating well therebetween such that when said explosive charge is initiated said plunger conductive means is forced into said insulating well out of electrical contact with said circuit pins.
5. An explosive switch according to claim 4 wherein said well is covered with a breakaway barrier.
6. An explosive switch according to claim 1 wherein at least two plungers are in cooperative relationship with at least two pairs of circuit pins passing through said base.
7. An explosive switch according to claim 6 wherein the plunger conductive means of at least one plunger forms a closed circuit with at least one pair of circuit pins before said charge is initiated and at least a second plunger forms a closed circuit with a second pair of circuit pins after said charge is initiated.
8. An explosive switch according to claim 1 wherein said explosive charge is electrically initiated through a bridgewire connected across said pair of electrical contact pins in said piston.
US3793501A 1972-12-04 1972-12-04 Explosive switch Expired - Lifetime US3793501A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US31149472 true 1972-12-04 1972-12-04

Publications (1)

Publication Number Publication Date
US3793501A true US3793501A (en) 1974-02-19

Family

ID=23207143

Family Applications (1)

Application Number Title Priority Date Filing Date
US3793501A Expired - Lifetime US3793501A (en) 1972-12-04 1972-12-04 Explosive switch

Country Status (1)

Country Link
US (1) US3793501A (en)

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885223A (en) * 1974-04-11 1975-05-20 Colt Ind Operating Corp Explosively operated multi-circuit band switch including flexiable diaphragm bag contact
US4150266A (en) * 1977-01-27 1979-04-17 Networks Electronic Corp. Miniature pyrotechnic squib switch, single pole, normally open
US4224487A (en) * 1978-02-23 1980-09-23 Simonsen Bent P Fast acting explosive circuit interrupter
US4339638A (en) * 1980-10-15 1982-07-13 Mcdonnell Douglas Corporation Electrical switch
US4852494A (en) * 1987-11-16 1989-08-01 Williams Robert A Explosively actuated switch
US5070787A (en) * 1988-06-24 1991-12-10 The Board Of Regents Of The University Of Texas System Method and apparatus for switching an electrical circuit
US5416286A (en) * 1993-10-19 1995-05-16 Dixon, Jr.; Alfred R. High amperage, high efficiency electrical slide switch assembly with plug and socket contacts
DE4422249A1 (en) * 1994-06-24 1996-02-15 Temic Bayern Chem Airbag Gmbh A device for interrupting the current flow in the ground wire of a motor vehicle battery
WO1997041582A1 (en) * 1996-04-27 1997-11-06 Dynamit Nobel Gmbh Explosivstoff- Und Systemtechnik Pyrotechnic switching element for electric circuits
WO1997041583A1 (en) * 1996-04-27 1997-11-06 Dynamit Nobel Gmbh Explosivstoff- Und Systemtechnik Pyrotechnic circuit-breaking element for electric circuits
US5757150A (en) * 1993-08-12 1998-05-26 Fuji Electric Co., Ltd. Electric system of an electric vehicle
WO1999005729A2 (en) * 1997-07-25 1999-02-04 Minnesota Mining And Manufacturing Company Bypass apparatus and method for series connected energy storage devices
EP0910104A1 (en) * 1997-10-16 1999-04-21 Alcatel Alsthom Compagnie Generale D'electricite Security device for an electrochemical battery
US5952815A (en) * 1997-07-25 1999-09-14 Minnesota Mining & Manufacturing Co. Equalizer system and method for series connected energy storing devices
US6087036A (en) * 1997-07-25 2000-07-11 3M Innovative Properties Company Thermal management system and method for a solid-state energy storing device
US6099986A (en) * 1997-07-25 2000-08-08 3M Innovative Properties Company In-situ short circuit protection system and method for high-energy electrochemical cells
US6100702A (en) * 1997-07-25 2000-08-08 3M Innovative Properties Company In-situ fault detection apparatus and method for an encased energy storing device
US6117584A (en) * 1997-07-25 2000-09-12 3M Innovative Properties Company Thermal conductor for high-energy electrochemical cells
US6120930A (en) * 1997-07-25 2000-09-19 3M Innovative Properties Corporation Rechargeable thin-film electrochemical generator
US6146778A (en) * 1997-07-25 2000-11-14 3M Innovative Properties Company Solid-state energy storage module employing integrated interconnect board
US6235425B1 (en) 1997-12-12 2001-05-22 3M Innovative Properties Company Apparatus and method for treating a cathode material provided on a thin-film substrate
US6344788B1 (en) * 1998-12-30 2002-02-05 Pyroalliance Pyrotechnically operated electrical contactor
US6411190B1 (en) * 1999-08-03 2002-06-25 Yazaki Corporation Circuit breaker
US6448884B1 (en) * 1999-08-27 2002-09-10 Yazaki Corporation Circuit breaker
US20060049027A1 (en) * 2004-09-08 2006-03-09 Iversen Arthur H Fast acting, low cost, high power transfer switch
WO2014048495A1 (en) * 2012-09-28 2014-04-03 Autoliv Development Ab Electrical pyrotechnic switch

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2931874A (en) * 1953-10-08 1960-04-05 Audley B Leaman Explosive switch
GB916030A (en) * 1958-07-15 1963-01-16 Cathodeon Ltd Improvements in or relating to impact-operable electric alarm switch devices
US3264438A (en) * 1964-04-29 1966-08-02 Atlas Chem Ind Positive action circuit breaking switch
US3277255A (en) * 1963-10-22 1966-10-04 Bofors Ab Single use circuit breaker
US3286064A (en) * 1965-03-31 1966-11-15 Wilson Louis Sublimation timing switch

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2931874A (en) * 1953-10-08 1960-04-05 Audley B Leaman Explosive switch
GB916030A (en) * 1958-07-15 1963-01-16 Cathodeon Ltd Improvements in or relating to impact-operable electric alarm switch devices
US3277255A (en) * 1963-10-22 1966-10-04 Bofors Ab Single use circuit breaker
US3264438A (en) * 1964-04-29 1966-08-02 Atlas Chem Ind Positive action circuit breaking switch
US3286064A (en) * 1965-03-31 1966-11-15 Wilson Louis Sublimation timing switch

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885223A (en) * 1974-04-11 1975-05-20 Colt Ind Operating Corp Explosively operated multi-circuit band switch including flexiable diaphragm bag contact
US4150266A (en) * 1977-01-27 1979-04-17 Networks Electronic Corp. Miniature pyrotechnic squib switch, single pole, normally open
US4224487A (en) * 1978-02-23 1980-09-23 Simonsen Bent P Fast acting explosive circuit interrupter
US4339638A (en) * 1980-10-15 1982-07-13 Mcdonnell Douglas Corporation Electrical switch
US4852494A (en) * 1987-11-16 1989-08-01 Williams Robert A Explosively actuated switch
US5070787A (en) * 1988-06-24 1991-12-10 The Board Of Regents Of The University Of Texas System Method and apparatus for switching an electrical circuit
US5757150A (en) * 1993-08-12 1998-05-26 Fuji Electric Co., Ltd. Electric system of an electric vehicle
US5416286A (en) * 1993-10-19 1995-05-16 Dixon, Jr.; Alfred R. High amperage, high efficiency electrical slide switch assembly with plug and socket contacts
DE4422249A1 (en) * 1994-06-24 1996-02-15 Temic Bayern Chem Airbag Gmbh A device for interrupting the current flow in the ground wire of a motor vehicle battery
US5621197A (en) * 1994-06-24 1997-04-15 Temic Bayern-Chemie Airbag Gmbh Device for interrupting the flow of current in the positive or impregnated vehicle battery cable
WO1997041582A1 (en) * 1996-04-27 1997-11-06 Dynamit Nobel Gmbh Explosivstoff- Und Systemtechnik Pyrotechnic switching element for electric circuits
WO1997041583A1 (en) * 1996-04-27 1997-11-06 Dynamit Nobel Gmbh Explosivstoff- Und Systemtechnik Pyrotechnic circuit-breaking element for electric circuits
US6548206B1 (en) 1997-07-25 2003-04-15 3M Innovative Properties Company In-situ short-circuit protection system and method for high-energy electrochemical cells
US6797018B2 (en) 1997-07-25 2004-09-28 3M Innovative Properties Company Solid-state energy storage module employing integrated interconnect board
EP1414129A3 (en) * 1997-07-25 2004-07-21 3M Innovative Properties Company Bypass apparatus and method for series connected energy storage devices
WO1999005729A3 (en) * 1997-07-25 1999-07-01 Minnesota Mining & Mfg Bypass apparatus and method for series connected energy storage devices
US5952815A (en) * 1997-07-25 1999-09-14 Minnesota Mining & Manufacturing Co. Equalizer system and method for series connected energy storing devices
US6087036A (en) * 1997-07-25 2000-07-11 3M Innovative Properties Company Thermal management system and method for a solid-state energy storing device
EP1414129A2 (en) * 1997-07-25 2004-04-28 3M Innovative Properties Company Bypass apparatus and method for series connected energy storage devices
WO1999005729A2 (en) * 1997-07-25 1999-02-04 Minnesota Mining And Manufacturing Company Bypass apparatus and method for series connected energy storage devices
US6100702A (en) * 1997-07-25 2000-08-08 3M Innovative Properties Company In-situ fault detection apparatus and method for an encased energy storing device
US6117584A (en) * 1997-07-25 2000-09-12 3M Innovative Properties Company Thermal conductor for high-energy electrochemical cells
US6120930A (en) * 1997-07-25 2000-09-19 3M Innovative Properties Corporation Rechargeable thin-film electrochemical generator
US6146778A (en) * 1997-07-25 2000-11-14 3M Innovative Properties Company Solid-state energy storage module employing integrated interconnect board
US6641942B1 (en) 1997-07-25 2003-11-04 3M Innovative Properties Company Solid-state energy storage module employing integrated interconnect board
US6569559B1 (en) 1997-07-25 2003-05-27 3M Innovative Properties Company Method for transferring thermal energy and electrical current in thin-film electrochemical cells
US6099986A (en) * 1997-07-25 2000-08-08 3M Innovative Properties Company In-situ short circuit protection system and method for high-energy electrochemical cells
FR2770050A1 (en) * 1997-10-16 1999-04-23 Alsthom Cge Alcatel Safety device for an electrochemical accumulator
EP0910104A1 (en) * 1997-10-16 1999-04-21 Alcatel Alsthom Compagnie Generale D'electricite Security device for an electrochemical battery
US6090501A (en) * 1997-10-16 2000-07-18 Alcatel Safety device for an electrochemical storage cell
US6235425B1 (en) 1997-12-12 2001-05-22 3M Innovative Properties Company Apparatus and method for treating a cathode material provided on a thin-film substrate
US6517591B2 (en) 1997-12-12 2003-02-11 3M Innovative Properties Company Apparatus and method for treating a cathode material provided on a thin-film substrate
US6344788B1 (en) * 1998-12-30 2002-02-05 Pyroalliance Pyrotechnically operated electrical contactor
US6411190B1 (en) * 1999-08-03 2002-06-25 Yazaki Corporation Circuit breaker
US6448884B1 (en) * 1999-08-27 2002-09-10 Yazaki Corporation Circuit breaker
US20060049027A1 (en) * 2004-09-08 2006-03-09 Iversen Arthur H Fast acting, low cost, high power transfer switch
US7498923B2 (en) 2004-09-08 2009-03-03 Iversen Arthur H Fast acting, low cost, high power transfer switch
WO2014048495A1 (en) * 2012-09-28 2014-04-03 Autoliv Development Ab Electrical pyrotechnic switch
US9646788B2 (en) 2012-09-28 2017-05-09 Autoliv Development Ab Electrical pyrotechnic switch

Similar Documents

Publication Publication Date Title
US3327081A (en) Contact with high resistance material insert
US3509298A (en) Disturbance switch
US4935590A (en) Gas-blast circuit breaker
US4339638A (en) Electrical switch
US4068204A (en) Thermal fuse employing a slidable resilient contact member in a conductive housing
US3519972A (en) Temperature responsive electric switch
US5576509A (en) Pyrotechnic detonator and method for manufacturing same
US6281780B1 (en) Electrical apparatus having improved electrical contact and electrical contact used therewith
US3743849A (en) Apparatus for automatically disconnecting power circuit for vehicles due to impact
US3611240A (en) Dropout fuse
US3420174A (en) Pulse sensitive electro-explosive device
US4276531A (en) Nonresetable thermally actuated switch
US2300142A (en) Fusible electric protective device
US3930215A (en) Nonresettable thermally actuated switch
US3180958A (en) Thermal switch having temperature sensitive pellet and sliding disc contact
US3264438A (en) Positive action circuit breaking switch
US3585328A (en) Pressure switch with a plurality of snap acting metal diaphragms coated with metallic oxide
US4276532A (en) Thermal fuse
US3110787A (en) Miniature electrical fuse
US6194988B1 (en) Low melting point element fusion apparatus and circuit breaker including the same
US4692577A (en) Switch for a high-voltage interrupting module
US3763782A (en) Metal layer initiator
US2764091A (en) Piezoelectric fuse
US3636292A (en) Vacuum switch for alternating current interruption
US2377134A (en) Tilt-type lever-operated switch